Team worked really well. Production Expert does most of the damage to the boss. The boss has 900k HP. My team did ~443k damage, leaving at a minimum 457k damage dealt to the boss from Production Expert and its summon. Realistically, it did a bit more than that since my dolls killed adds so not all of their damage was dealt to the boss.

If you utilize Production Expert and have a Suomi + Springfield combo this is an easy 40/40. You have 20 turns, so PE will actually solo kill this boss even if you don't deal damage if you just live long enough and bring the boss over to PE so it can do its thing.